单项选择题

A．Seasonal variations in nature.
B．How intelligence changes with the change of seasons.
C．How we can improve our intelligence.
D．Why summer is the best season for vacation.
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单项选择题
A．Three.B．Four.C．Five.D．Six.
A．Three.
B．Four.
C．Five.
D．Six.
单项选择题
A．A policeman is interviewing a witness.B．A police sergeant is interrogating a culprit.C．They are having a discussion about a criminal case.D．They are holding a court investigation of a crime.
A．A policeman is interviewing a witness.
B．A police sergeant is interrogating a culprit.
C．They are having a discussion about a criminal case.
D．They are holding a court investigation of a crime.
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